The King's sudden death

"How... How is that possible Master? You once told me that pouring ten drops would make him fall in an endless coma, and to kill him I'd need to pour eleven drops."

Nodding his head, Bai Long didn't refute Cao Ning. 

"You're correct. I did say those words. But did you ever consider why I asked you to make sure that he consumes at least nine drops every day?"

"Because that would make sure he stays bedridden and the poison doesn't leave his body?"

"You're only part right, Ning'er. Those nine drops are not just to maintain the same state of poison and illness, but to even make sure his body doesn't die."

With her eyes turning wide in surprise and confusion, Cao Ning hastily asked, "How is that possible?"

Smiling in return, Bai Long said, "The Drops of Hell is a special kind of poison that was made to keep the victim in a state of helplessness until the one who used it was ready to kill the victim."